Adjust QuickQSPanel to fit Tablet display size

- Remove legacy standard_notification_panel_width
- Define default max columns for QQS layout
- Fix Pixcel C & Nexus 7 QQS Tiles over boundry problem

Test: atest SystemUITests
Fix: 110123402
Change-Id: I18ab3d966b3d18775d0b13d6d60d7c09485ba8ae